\chapter{Conclusion}
\label{chap:Conclusion}
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Our works focus on the modeling and simulating large and complex physical systems, especially natural phenomena, which recently emerged as a critical topic. We mainly consider two problems. The first one is long time simulations of vast physical systems. The other is handling the problem of lack of interoperability of physical models, which actually have several relations in reality. In addition, the complexity of modeling was also taken into account.
\section{Contributions}
In order to carry this out, we firstly proposed a methodology to develop distributed physical models based on the PickCell tool. A methodology based on this tool can conduce physical simulations in term of cell network systems.
Next, we also suggested an hybrid approach to tackle problems of large size and complicated behaviour of physical processes. This enables to create a distribution of several parallel simulations, which are simultaneously running and communicating.\\
Results from some experiments of parallel simulations were a lot encouraging. The parallel computations on the GPU help to dramatically reduce the simulating time of large models. The interoperability between several physical simulations in accordance with the HLA standard was also implemented.
\section{Future works}
We are going to apply our approach in reality. A proposition for simulating phenomena in Mekong Delta region (Vietnam) will be regarded. At which, flood, pollution, and cloud of insects are always considered problems.\\
Currently, a new version of PickCell tool is developing. There are new features such as getting elevation data as example, enables to generate 3D data.
%Upon with these results, 
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